Sr. Software Developer (Req #: 666)

This position is responsible for designing, developing, and maintaining enterprise software applications across the full technology stack. The Sr. Software Developer works within a small, high-impact technology team to build and evolve the internal platforms that power construction operations, project management, logistics, financial reporting, and AI-driven decision support systems. This role requires strong expertise in .NET backend development and modern JavaScript/TypeScript frontends, with a growing emphasis on integrating AI and large language model capabilities into business applications., 1. Design, develop, and maintain backend APIs and services using .NET 9 and ASP.NET Core, following Clean Architecture and CQRS patterns with MediatR

2. Build modern, responsive frontends with Next.js, React, TypeScript, and Tailwind CSS using component libraries such as shadcn/ui and AG Grid Enterprise
3. Integrate AI and large language model capabilities into internal tools using Anthropic Claude, OpenAI, and emerging agent frameworks such as Microsoft Agent Framework
4. Develop and optimize SQL Server databases, writing performant queries, managing Entity Framework Core migrations, and leveraging Dapper for high-throughput data access
5. Modernize legacy systems by migrating older .NET and Angular codebases to current frameworks and architectures
6. Build and maintain CI/CD pipelines with GitHub Actions, deploying applications to Windows Server/IIS and Azure cloud infrastructure
7. Implement and maintain background processing systems using Hangfire for scheduled jobs, queue processing, data synchronization, and automated notifications
8. Design and build reporting solutions using QuestPDF and ClosedXML, replacing legacy Crystal Reports and SSRS-based workflows
9. Integrate with external systems including Viewpoint Vista ERP, Microsoft Graph API, and Azure Active Directory (Entra ID)
10. Collaborate with a small technology team to scope, architect, and deliver features end-to-end, from database schema through API design to user interface
11. Participate in code reviews, architectural discussions, and continuous improvement of development practices and tooling
12. Support and troubleshoot production applications, diagnose performance issues, and implement monitoring and logging solutions using NLog, Serilog, and related tools, The Company will not accept unsolicited resumes from any source other than directly from candidates. Any unsolicited resumes sent to the Company, including via mailing address, fax machine, email, or directly to employees, will be considered the property of the Company. The Company will not pay any fee for placements resulting from unsolicited resumes. The Company will consider any candidate for whom an Agency has submitted an unsolicited resume to have been referred by the Agency free of any charges or fees.

Agencies must receive advance written approval from the Company's recruiting representative before submitting resumes, and only in conjunction with a valid, fully executed contract for service and in response to a specific job opening. The Company will not pay fees to any Agency without such an agreement in place. Agency agreements must be in writing and signed by the Human Resources Representative or their designee; no other Company employee is authorized to enter into agreements regarding candidate placements on behalf of the Company. Please send any questions or concern to HumanResources@lylessc.com.

To perform this job successfully, an individual must be able to perform each essential duty satisfactorily. The requirements listed below are representative of the knowledge, skill, and/or ability required. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions., 1. 5+ years of professional software development experience (9+ years in lieu of a degree)

2. Strong proficiency in C# and .NET (ASP.NET Core, Entity Framework Core, MediatR, dependency injection)
3. Experience building frontend applications with React and TypeScript
4. Solid SQL Server skills including query optimization, stored procedures, and schema design
5. Experience with RESTful API design and authentication patterns (JWT, OAuth 2.0, Windows Authentication)
6. Proficiency with Git version control and CI/CD pipelines (GitHub Actions preferred)
7. Ability to work across the full stack and take ownership of features from design through deployment
8. Strong communication skills and comfort working in a small, collaborative team environment

Desired Skills and Knowledge

1. Experience with AI/LLM integration, working with APIs from Anthropic, OpenAI, or similar providers
2. Familiarity with agent-based architectures and multi-agent systems
3. Experience with Clean Architecture, CQRS, and domain-driven design patterns
4. Exposure to Next.js, Dapper, Hangfire, QuestPDF, or AG Grid
5. Background in construction industry software, ERP integration, or Viewpoint Vista
6. Experience with Node.js backend development using Fastify or Express
7. Familiarity with Azure services including Azure AD/Entra ID, Blob Storage, and Service Bus
8. Experience with Prisma ORM, SQLite, or Playwright end-to-end testing
9. Knowledge of Tailwind CSS, shadcn/ui, Radix UI, or similar modern component libraries

Certificates, Licenses, Registrations

1. A valid California Driver's License

Competencies

To perform this job successfully, an individual should demonstrate the following competencies:

1. Effective Communication
2. Analytical Thinking
3. Results Oriented
4. Collaboration
5. Initiative
6. Thoroughness
7. Technical Problem-Solving
8. Continuous Learning
9. Personal Integrity

$220,100.00 - $366,800.00 per year

At Lyles Services Co., a subsidiary of Lyles Construction Group, of we take pride in our employee and client-centric culture. Our employees and customers are at the forefront of everything we do and how we operate our business. Safety is our top priority and we work hard to ensure everyone goes home to their loved ones each day. We are looking for ambitious individuals to join our team, who are passionate about their performance and who will continue to execute and believe in our core values of: 1. Teamwork: We recognize our primary asset is our people. Mutual respect provides the foundation for our success. 2. Integrity: Our work is performed with high standards of service, quality, and integrity and because of this, we have had the privilege to lead some of the most innovative projects in California. 3. Commitment: We understand that lasting relationships are the lifeline of our business so we pay personal attention to our clients by focusing on them as collaborative partners. If you are looking for a company who will value you and provide you with great employee benefits, training and development opportunities, career growth and the opportunity to be a part of something bigger, then Lyles Services Co. is right for you!